async_hooks: avoid double-destroy HTTPParser

Avoid that destroy hook is invoked twice - once via `Parser::Free()`
and once again via `Parser::Reinitialize()` by clearing the async_id
in `EmitDestroy()`.

Partial backport of nodejs#27477, a full
backport would require also nodejs#25094
which has a dont-land-on-v10.x label on it.

Fixes: nodejs#26961

Author: Flarna

src/async_wrap.cc

@@ -176,7 +176,7 @@ void AsyncWrap::EmitAfter(Environment* env, double async_id) {
 class PromiseWrap : public AsyncWrap {
  public:
   PromiseWrap(Environment* env, Local<Object> object, bool silent)
-      : AsyncWrap(env, object, PROVIDER_PROMISE, -1, silent) {
+      : AsyncWrap(env, object, PROVIDER_PROMISE, kInvalidAsyncId, silent) {
     MakeWeak();
   }
 
@@ -382,7 +382,7 @@ static void RegisterDestroyHook(const FunctionCallbackInfo<Value>& args) {
 
 void AsyncWrap::GetAsyncId(const FunctionCallbackInfo<Value>& args) {
   AsyncWrap* wrap;
-  args.GetReturnValue().Set(-1);
+  args.GetReturnValue().Set(kInvalidAsyncId);
   ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
   args.GetReturnValue().Set(wrap->get_async_id());
 }
@@ -409,10 +409,15 @@ void AsyncWrap::AsyncReset(const FunctionCallbackInfo<Value>& args) {
   AsyncWrap* wrap;
   ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
   double execution_async_id =
-      args[0]->IsNumber() ? args[0].As<Number>()->Value() : -1;
+      args[0]->IsNumber() ? args[0].As<Number>()->Value() : kInvalidAsyncId;
   wrap->AsyncReset(execution_async_id);
 }
 
+void AsyncWrap::EmitDestroy() {
+  AsyncWrap::EmitDestroy(env(), async_id_);
+  // Ensure no double destroy is emitted via AsyncReset().
+  async_id_ = kInvalidAsyncId;
+}
 
 void AsyncWrap::QueueDestroyAsyncId(const FunctionCallbackInfo<Value>& args) {
   CHECK(args[0]->IsNumber());
@@ -474,7 +479,7 @@ void AsyncWrap::Initialize(Local<Object> target,
   // kDefaultTriggerAsyncId: Write the id of the resource responsible for a
   //   handle's creation just before calling the new handle's constructor.
   //   After the new handle is constructed kDefaultTriggerAsyncId is set back
-  //   to -1.
+  //   to kInvalidAsyncId.
   FORCE_SET_TARGET_FIELD(target,
                          "async_id_fields",
                          env->async_hooks()->async_id_fields().GetJSArray());
@@ -558,15 +563,15 @@ AsyncWrap::AsyncWrap(Environment* env,
   CHECK_NE(provider, PROVIDER_NONE);
   CHECK_GE(object->InternalFieldCount(), 1);
 
-  async_id_ = -1;
+  async_id_ = kInvalidAsyncId;
   // Use AsyncReset() call to execute the init() callbacks.
   AsyncReset(execution_async_id, silent);
 }
 
 
 AsyncWrap::~AsyncWrap() {
   EmitTraceEventDestroy();
-  EmitDestroy(env(), get_async_id());
+  EmitDestroy();
 }
 
 void AsyncWrap::EmitTraceEventDestroy() {
@@ -602,16 +607,16 @@ void AsyncWrap::EmitDestroy(Environment* env, double async_id) {
 // and reused over their lifetime. This way a new uid can be assigned when
 // the resource is pulled out of the pool and put back into use.
 void AsyncWrap::AsyncReset(double execution_async_id, bool silent) {
-  if (async_id_ != -1) {
+  if (async_id_ != kInvalidAsyncId) {
     // This instance was in use before, we have already emitted an init with
     // its previous async_id and need to emit a matching destroy for that
     // before generating a new async_id.
-    EmitDestroy(env(), async_id_);
+    EmitDestroy();
   }
 
   // Now we can assign a new async_id_ to this instance.
-  async_id_ =
-    execution_async_id == -1 ? env()->new_async_id() : execution_async_id;
+  async_id_ = execution_async_id == kInvalidAsyncId ? env()->new_async_id()
+                                                     : execution_async_id;
   trigger_async_id_ = env()->get_default_trigger_async_id();
 
   switch (provider_type()) {
@@ -693,7 +698,7 @@ async_id AsyncHooksGetExecutionAsyncId(Isolate* isolate) {
   // Environment::GetCurrent() allocates a Local<> handle.
   HandleScope handle_scope(isolate);
   Environment* env = Environment::GetCurrent(isolate);
-  if (env == nullptr) return -1;
+  if (env == nullptr) return AsyncWrap::kInvalidAsyncId;
   return env->execution_async_id();
 }
 
@@ -702,7 +707,7 @@ async_id AsyncHooksGetTriggerAsyncId(Isolate* isolate) {
   // Environment::GetCurrent() allocates a Local<> handle.
   HandleScope handle_scope(isolate);
   Environment* env = Environment::GetCurrent(isolate);
-  if (env == nullptr) return -1;
+  if (env == nullptr) return AsyncWrap::kInvalidAsyncId;
   return env->trigger_async_id();
 }
 
@@ -727,7 +732,7 @@ async_context EmitAsyncInit(Isolate* isolate,
   CHECK_NOT_NULL(env);
 
   // Initialize async context struct
-  if (trigger_async_id == -1)
+  if (trigger_async_id == AsyncWrap::kInvalidAsyncId)
     trigger_async_id = env->get_default_trigger_async_id();
 
   async_context context = {

src/async_wrap.h

@@ -108,10 +108,12 @@ class AsyncWrap : public BaseObject {
   AsyncWrap(Environment* env,
             v8::Local<v8::Object> object,
             ProviderType provider,
-            double execution_async_id = -1);
+            double execution_async_id = kInvalidAsyncId);
 
   virtual ~AsyncWrap();
 
+  static constexpr double kInvalidAsyncId = -1;
+
   static v8::Local<v8::FunctionTemplate> GetConstructorTemplate(
       Environment* env);
 
@@ -137,6 +139,8 @@ class AsyncWrap : public BaseObject {
   static void EmitAfter(Environment* env, double async_id);
   static void EmitPromiseResolve(Environment* env, double async_id);
 
+  void EmitDestroy();
+
   void EmitTraceEventBefore();
   static void EmitTraceEventAfter(ProviderType type, double async_id);
   void EmitTraceEventDestroy();
@@ -149,7 +153,8 @@ class AsyncWrap : public BaseObject {
 
   inline double get_trigger_async_id() const;
 
-  void AsyncReset(double execution_async_id = -1, bool silent = false);
+  void AsyncReset(double execution_async_id = kInvalidAsyncId,
+                  bool silent = false);
 
   // Only call these within a valid HandleScope.
   v8::MaybeLocal<v8::Value> MakeCallback(const v8::Local<v8::Function> cb,
@@ -202,7 +207,7 @@ class AsyncWrap : public BaseObject {
   inline AsyncWrap();
   const ProviderType provider_type_;
   // Because the values may be Reset(), cannot be made const.
-  double async_id_ = -1;
+  double async_id_ = kInvalidAsyncId;
   double trigger_async_id_;
 };
 

src/node_http_parser.cc

@@ -383,14 +383,13 @@ class Parser : public AsyncWrap, public StreamListener {
 
 
   static void Free(const FunctionCallbackInfo<Value>& args) {
-    Environment* env = Environment::GetCurrent(args);
     Parser* parser;
     ASSIGN_OR_RETURN_UNWRAP(&parser, args.Holder());
 
     // Since the Parser destructor isn't going to run the destroy() callbacks
     // it needs to be triggered manually.
     parser->EmitTraceEventDestroy();
-    parser->EmitDestroy(env, parser->get_async_id());
+    parser->EmitDestroy();
   }
 
 

test/parallel/test-async-hooks-http-parser-nodouble-destroy.js

@@ -0,0 +1,53 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const { createHook } = require('async_hooks');
+const http = require('http');
+
+// Regression test for https://github.com/nodejs/node/issues/19859.
+// Checks that matching destroys are emitted when creating new/reusing old http
+// parser instances.
+
+const httpParsers = [];
+const dupDestroys = [];
+const destroyed = [];
+
+createHook({
+  init(asyncId, type, triggerAsyncId, resource) {
+    if (type === 'HTTPPARSER') {
+      httpParsers.push(asyncId);
+    }
+  },
+  destroy(asyncId) {
+    if (destroyed.includes(asyncId)) {
+      dupDestroys.push(asyncId);
+    } else {
+      destroyed.push(asyncId);
+    }
+  }
+}).enable();
+
+const server = http.createServer((req, res) => {
+  res.end();
+});
+
+server.listen(common.mustCall(() => {
+  http.get({ port: server.address().port }, common.mustCall(() => {
+    server.close(common.mustCall(() => {
+      server.listen(common.mustCall(() => {
+        http.get({ port: server.address().port }, common.mustCall(() => {
+          server.close(common.mustCall(() => {
+            setTimeout(common.mustCall(verify), 200);
+          }));
+        }));
+      }));
+    }));
+  }));
+}));
+
+function verify() {
+  assert.strictEqual(httpParsers.length, 4);
+
+  assert.strictEqual(dupDestroys.length, 0);
+  httpParsers.forEach((id) => assert.ok(destroyed.includes(id)));
+}